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In class today we observed the conditions necessary to create a cloud. We read about the ingredients for a cloud: water vapor, a nucleation point (e.g. smoke or dust), and cooling temperatures.
We then discussed how we would model this in a 2L plastic bottle. We easily figured that the water vapor would come from hot water, nucleation could happen on smoke from a punk stick, and cooling the container could happen through a pressure change.
Next we had to predict which type of pressure change would result in a cooler temperature: low pressure or high pressure. The classes were divided on this. Students who said a high pressure did so because of our previous investigations: high pressure was created by using ice. Therefore, if we want the container to cool, we need to increase its pressure. Students who said a low pressure did so because of observations of where clouds appear: they most commonly seem to be near low pressure areas.
We then conducted the investigation and quickly found the answer. What I want you to do is complete the first part of handout 120: answer the pre-investigation questions and create your prediction. Then, check you prediction with a video of our investigation made with my students from last year. Did the cloud from under high pressure (squeezing the bottle) or low pressure (letting go of the bottle)? Use that to answer the remaining questions.
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